Option 1 -> Vikram Sarabhai is known as the Father of the Indian Space Program, founding ISRO and laying the foundation for India's space research.
Option 2 -> K. Radhakrishnan served as Chairman of ISRO and led successful missions like Mars Orbiter Mission (Mangalyaan).
Option 3 -> Homi J. Bhabha is recognized as the Father of the Indian Nuclear Program and founded the Tata Institute of Fundamental Research.
Option 4 -> A.P.J. Abdul Kalam earned the title 'Missile Man of India' for his pioneering work in developing India's missile technology and defense systems.
Hence, Option 4: A.P.J. Abdul Kalam -> He played a crucial role in developing ballistic missile and launch vehicle technology, including the Agni and Prithvi missiles, and served as the Chief Scientific Adviser to the Prime Minister before becoming India's 11th President -> correct